Forum - MCS Electronics

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philm

Joined: 14 Jul 2004
Posts: 138
Location: Australia

 Posted: Mon Feb 26, 2007 5:38 am    Post subject: speedometer calibration Hello all. The odometer in my car failed, I opened it up, and fixed it (broken plastic lever). In order to repair it, I had to remove the needle of the speedometer. Now the speedometer is out of calibration. It is about 9% low. Printed on the back of the speedomter is 637rev = 1km. Therefore I assume a signal of 637/3600 = 0.176944Hz = 1km/h and 17.7Hz = 100km/h. BUT this is not right about 68Hz = 100km/h & about 40Hz = 60klm/h Are all speedos calibrated the same? ie Freq1 = klm/h1 Anyone know what freq = what klm/h? Thanks Phil
philm

Joined: 14 Jul 2004
Posts: 138
Location: Australia

 Posted: Mon Feb 26, 2007 10:59 am    Post subject: Worked it out. 637rev = 1km & the sensor gives 4 pulses per rev So, everything was out by a factor of 4. 100klm/h = 70.8Hz
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